PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 204
PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
Specifications of PNX1500E
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Volume 1 of 1
Table 1: The Boot Modes
PNX15XX_PNX952X_SER_N_4
Product data sheet
BOOT_MODE
Bits
7
6:4
GPIO
pins
11
10:8
2.1 The Boot Modes
Default Function
-
-
software driver (which runs on the host processor) can finish the configuration of the
PNX15xx/952x Series system, download the TM3260 binary code and then release
the TM3260 from its reset state.
The boot modes are defined by the state of the BOOT_MODE[7:0] pins at reset time.
Therefore adequate pull-ups and pull-downs should be placed on the system board in
order to select the correct mode. Once the internal signal peri_rst_n is released, the
BOOT_MODE[7:0] pins are sampled. The sampling mechanism delays the peri_rst_n
signal by two clk_27 (the initial 27 MHz clock) periods and delays the sampling of the
BOOT_MODE[7:0] pins by five clk_27 periods. This ensures the correct values of the
BOOT_MODE pins are latched properly, since after the reset goes away, the values
on the GPIO pins may become indeterministic.
The different boot modes based on the state of the BOOT_MODE[7:0] pins is
described in the following
EN_PCI_ARB
MEM_SIZE
Rev. 4.0 — 03 December 2007
Description
1 - Enables the internal PCI system arbiter
0 - Disables the internal PCI system arbiter
Informs the boot scripts of the total memory size available on the
system board. This information is crucial to properly set-up the
PCI configuration management in host-assisted mode.
The pin code is as follows:
000 - 2MB
001 - 4MB
010 - 8MB
011 - 16MB
100 - 32MB
101 - 64MB
110 - 128MB
111 - 256MB
Table
1.
PNX15xx/952x Series
Chapter 6: Boot Module
© NXP B.V. 2007. All rights reserved.
6-204
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